<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区-->
    <el-card>
      <!--添加分类-->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--分类列表展示-->
      <tree-table
        class="treeTable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        border
      >
        <!-- 是否有效 -->
        <template slot="iswork" slot-scope="scope">
          <i v-if="scope.row.cat_deleted === false" class="el-icon-success" style="color: green"></i>
          <i v-else class="el-icon-error" style="color: red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level === 0" type="primary" size="mini">一级</el-tag>
          <el-tag v-else-if="scope.row.cat_level === 1" type="success" size="mini">二级</el-tag>
          <el-tag v-else type="warning" size="mini">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="operation">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
      </tree-table>
      <!--分页区-->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[5, 10, 15, 20]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加分类表单 -->
      <el-form :model="addCateForm" :rules="addCateRules" ref="addCateRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- Cascader 级联选择器 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="{ expandTrigger: 'hover', checkStrictly:true, emitPath: 'true', value: 'cat_id', label: 'cat_name', children: 'children' }"
            @change="parentCateChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Category',
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 总数据量
      total: 0,
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // tree-table列定义属性
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          prop: 'cat_deleted',
          type: 'template',
          template: 'iswork'
        },
        {
          label: '排序',
          prop: 'cat_level',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'operation'
        }
      ],
      // 分类对话框的显示与否
      addDialogVisible: false,
      // 添加分类表单数据
      addCateForm: {
        cat_pid: 0,
        cat_name: '',
        cat_level: 0
      },
      // 验证规则
      addCateRules: {
        cat_name: [{ required: true, message: '请输入分类名', trigger: 'blur' }]
      },
      // 父级分类列表
      parentCateList: [],
      // 选中父级分类id
      selectedKeys: []
    }
  },
  created() {
    // 获取商品分类列表
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('请求分类列表失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 展示添加分类对话框
    showAddCateDialog() {
      // 获取父级分类列表
      this.getParentCateList()
      this.addDialogVisible = true
    },
    // 获取父级分类列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类列表失败')
      }
      this.parentCateList = res.data
      // console.log(this.parentCateList)
    },
    // 选择项发生改变
    parentCateChange() {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 添加分类
    addCate() {
      this.$refs.addCateRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('提交失败')
        }
        this.$message.success('提交成功')
        this.getCateList()
        this.addDialogVisible = false
      })
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addCateRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>

<style scoped>
.treeTable {
  margin-top: 15px;
}
</style>
